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Note 4 - Investments - Schedule of Carrying Value and Fair Value of Equity Securities (Details) - USD ($) | Apr. 30, 2021 | Apr. 30, 2020 | May 01, 2018
--- | --- | --- | ---
Equity securities, cost | $ 19,105,000 | $ 12,877,000 |
Equity securities, gross unrealized gains |  |  | $ 994,000
Equity securities, fair value | 23,582,000 | 14,125,000 | $ 9,379,000
Exchange Traded Funds [Member] |  |  |
Equity securities, cost | 19,105,000 | 12,877,000 |
Equity securities, gross unrealized gains | 4,532,000 | 1,317,000 |
Equity securities, gross unrealized losses | (55,000) | (69,000) |
Equity securities, fair value | $ 23,582,000 | $ 14,125,000 |

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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740 + Details
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